This is a historical HP all-in-one report with Intel Ready Mode Service installed. It does not apply to an unidentified service or to every Windows 11 sign-in loop.
- After upgrading to Windows 11, sign-in produced a black screen and immediately returned to the login screen.
- Disabled the Intel Ready Mode service.
Reported outcome: A participant with the same HP all-in-one and failure explicitly confirmed it solved the loop.
Open services.msc, record that service’s original startup type and state, then change only the identified Intel Ready Mode entry. Restore the recorded configuration if the test does not resolve the loop.